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Reaction of isatoic anhydride with aniline derivatives gave 2-amino-N-(aryl)benzamides.The latters reacted with phenyli-sothiocyanate in the presence of heteropolyacids in various solvents which afforded 3-(aryl)-2-thioxo-2,3-dihydroquinazolin- 4(1H)-one derivatives.The effects of various heteropolyacids including Preyssler and Keggin on the yields and reaction times have been investigated.
Reaction of isatoic anhydride with aniline derivatives gave 2-amino-N- (aryl) benzamides.The latters reacted with phenyli-sothiocyanate in the presence of heteropolyacids in various solvents which afforded 3- (aryl) -2-thioxo-2,3- dihydroquinazolin-4 (1H) -one derivatives. These effects of various heteropolyacids including Preyssler and Keggin on the yield and reaction times have been investigated.